CN105264797A - Enhanced node b and methods for network assisted interference cancellation with reduced signaling - Google Patents

Enhanced node b and methods for network assisted interference cancellation with reduced signaling Download PDF

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CN105264797A
CN105264797A CN201480031508.6A CN201480031508A CN105264797A CN 105264797 A CN105264797 A CN 105264797A CN 201480031508 A CN201480031508 A CN 201480031508A CN 105264797 A CN105264797 A CN 105264797A
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entry
code book
less
transmission
signaling code
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CN105264797B (en
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简·艾伦贝克
萨宾·罗塞尔
伯恩哈德·拉厄夫
托尔斯敦·克利翁
史蒂芬·弗朗茨
阿列克谢·达维多夫
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Intel Corp
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Intel IP Corp
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    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
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    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract

Embodiments of an enhanced node B (eNB) and methods for network-assisted interference cancellation with reduced signaling in a 3GPP LTE network are generally described herein. In some embodiments, the number of transmission options is reduced by introducing a smaller signaling codebook. In some embodiments, higher-layer feedback from the UE to the eNodeB is established to inform the eNB about certain NA-ICS capabilities of the UE. In some embodiments, the number of signaling options is reduced by providing only certain a priori information. In some embodiments, correlations in the time and/or frequency domain are exploited for reducing the signaling message. In some embodiments, differential information is signaled in the time and/or frequency domain for reducing the signaling message.

Description

Utilize the enhancement mode Node B of carrying out network-assisted interference elimination and the method for the signaling reduced
related application
This application claims the U.S. Patent Application Serial Number 14/134 submitted on December 19th, 2013, the priority of 461, and require the U.S. Provisional Patent Application sequence number 61/843 submitted on July 8th, 2013, the priority of 826, each application in these two applications is all incorporated into this by reference.
Technical field
Embodiment is relevant with radio communication.Some embodiments relate to interference and eliminate, and the network-assisted interference comprised in 3GPP-LTE network is eliminated.
Background technology
In order to optimize down link (DL) throughput and minimize radio bearer setup complete, in minizone and community, cochannel interference mitigation is in the task of most critical in Long Term Evolution (LTE) subscriber equipment (UE) receiver one.The type of the interference of UE experience can change with Physical Resource Block (PRB) and with Transmission Time Interval (TTI).In addition, the type of the interference of UE experience depends on the type of the distribution that the UE in adjacent cell receives from their service enhancement mode Node B (eNB).Traditional interference mitigation technology cannot solve the interference of these types effectively.
Therefore, there is general demand in the interference mitigation technology for the improvement in LTE network.General demand is existed for the more effective interference mitigation technology in LTE network.
Accompanying drawing explanation
Fig. 1 shows the part with the end to end network framework of LTE (Long Term Evolution) network of the various assemblies of network according to embodiment;
Fig. 2 show according to some embodiments with PRB and the interference variations with TTI.
Fig. 3 shows the structure of the down-chain resource grid of the downlink transmission from eNB to UE according to some embodiments.
Fig. 4 shows the functional block diagram of the UE according to some embodiments.
Embodiment
Description below and drawing sufficiently illustrate specific embodiment and can implement them to make those skilled in the art.Other embodiment can comprise structure, logic, electrically, the change of process and other side.The part of some embodiments and feature can be included in the part of other embodiment and feature or can by the part of other embodiment and character displacements.The embodiment proposed in claim contains all available equivalent of those claims.
Fig. 1 shows the part with the end to end network framework of the LTE network of the various assemblies of network according to some embodiments.Network comprises radio access network (such as, the E-UTRAN described or evolved universal terrestrial radio Access Network) 102 and core net (EPC) 120, together with radio access network 102 and EPC120 are coupling in by S1 interface 115.Note, for convenience and simplicity, illustrate only a part of core net and RAN.
Core net (EPC) 120 comprises Mobility Management Entity (MME) 122, gateway (service GW) 124 and grouped data network gateway (PDNGW) 126.RAN102 comprises macro base station (being also referred to as grand eNodeB or eNB) 105, low-power (LP) base station (or LPeNB) 106,107 and UE (subscriber equipment or mobile terminal) 110.
MME is functionally similar to the control plane of traditional services GPRS Support Node (SGSN).Mobility aspect in MME management access, such as gateway is selected and trace regions list management.Service GW124 stops towards the interface of RAN, and route data grouping between RAN and core net.In addition, it can be the local mobility anchor (anchorpoint) for switching between eNode-B, and can be provided for ambulant anchor point between 3GPP.Other responsibilities can comprise lawful intercept, charging and some strategy execution.Service GW and MME can be implemented in a physical node or the physical node that separates.PDNGW stops the SGi interface towards packet data network (PDN).It is route data grouping between EPC and outside PDN, and can be the key node for strategy execution and accounting data collection.It can also be provided for the ambulant anchor point with non-LTE access.Outside PDN can be IP network and IP Multimedia System (IMS) territory of any kind.PDNGW and service GW can be implemented in a physical node or the physical node that separates.
ENode-B (grand eNode-B and micro-eNode-B) stops air interface protocol and (although not necessarily) is the first make contact for UE110 usually.In certain embodiments, eNode-B can realize the various logic function of RAN, include but not limited to RNC (radio network controller function), the such as management of radio bearer management, up link and down link dynamic radio resources and packet scheduling and mobile management.
S1 interface is the interface be separated by RAN with EPC.S1 interface is divided into two parts: S1-U and S1-MME, and wherein, S1-U is carrier flow rate data between eNode-B and service GW, and S1-MME is the signaling interface between eNode-B and MME.X2 interface is the interface (at least between most of eNode-B, will discussed below with regard to micro-eNB) between eNode-B.X2 interface comprises two parts: X2-C and X2-U.X2-C is the control plane interface between eNode-B, and X2-U is the user plane interface between eNode-B.
For cellular network, LP community is normally used for the room area that cannot be arrived very well by coverage extension to outdoor signal or is used to increase phone using network capacity in the region (such as, railway station) of very dense.As used herein, term low-power (LP) eNB refers to the eNode-B of any suitable relative low-power of the narrower community (narrower than macrocell) for realizing such as Femto cell, picocell or Microcell and so on.Femto cell eNB is supplied to its residential customer or enterprise customer usually by Mobile Network Operator.Femto cell is the size of residential gateway or less size normally, and is typically connected to the broadband line of user.Once be inserted into (pluggedin), Femto cell is just connected to the mobile network of mobile operator and provides scope to be generally the extra covering of 30 to 50 meters for house Femto cell.Therefore, LPeNB107 may be Femto cell eNB, because it is coupled by PDNGW126.Similarly, picocell is the wireless communication system in territory, usual coverage cell (such as, in building (office, shopping center, railway station etc.) or recently aboard).Picocell eNB can be connected to another eNB (such as, grand eNB) by its base station controller (BSC) function by X2 link usually.Therefore, LPeNB106 can be implemented with picocell eNB, and this is because it is coupled to grand eNB via X2 interface.Therefore, picocell eNB or other LPeNB can comprise some functions or the repertoire of grand eNB.In some cases, it can be called as access point base station or enterprise Femto cell.
According to embodiment, eNB can be arranged to be provided network-assisted (NA) to disturb to UE110 to eliminate signaling (NA-ICS), alleviate for coordinates interference, (IC) or for performing AF panel (IS) is eliminated in interference.In certain embodiments, the quantity transmitting option is reduced by introducing less signaling code book.In certain embodiments, the higher level feedback from UE to eNodeB is established to notify eNB some NA-ICS ability about UE.In certain embodiments, the quantity of signaling option is by only providing specific prior information to be reduced.In certain embodiments, the correlation in time domain and/or frequency domain is used to reduce signaling message.In certain embodiments, different information is sent out for minimizing NA-ICS message with signal in the time and/or frequency domain.These embodiments are discussed in more detail below.In certain embodiments, eNB can comprise for providing network-assisted physical layer circuit and treatment circuit to UE110, alleviates for coordinates interference as discussed herein.
How Fig. 2 changes with PRB and with TTI according to the type that some embodiments show interference.As mentioned above, in order to optimize down link (DL) throughput and minimize radio bearer setup complete, in minizone and community, cochannel interference mitigation is in the task of more and more key in UE receiver one.When optimizing UE receiver performance maybe when weighing performance and UE receiver power consumption and/or UE cost, the alleviation that cochannel disturbs will from network-assisted middle benefit.In these embodiments, LTE network side information (sideinformation) can be provided coordinate or both combination so as to simplify, the enable or interference optimized in UE receiver eliminates (IC) or AF panel (IS).Network-assisted information can be called as " IC/IS side information ", and (1) order of modulation of interference signal and (2) precoder information (such as, code book, #TX, # layer, PMI) can be provided to the part in the IC/IS side information of UE.Such as: utilize such IC/IS side information, (being similar to) maximum likelihood detector detecting Resource Block 202 (Fig. 2) in UE (ideally) will can also fall into interference (UE distribute the RB204) signal of the Resources allocation block of the UE of expectation by rectification, make it possible to complete the elimination to the signal (RB204) that UE distributes ideally, improve the DL throughput of UE in Serving cell 201.For the co-channel inter-cell disturbed condition of (especially in the grand network of isomorphism) in all deployment situations, may need to be solved for suitable/effective (one or more) method for general co-channel inter-cell disturbed condition IC/IS side information signal being sent to LTEUE: especially meet signaling request, minimize the method for assisting change and the optimized network of LTE standard and/or UE receiver implementation.
Embodiment more disclosed herein solves minimizing the quantity of IC/IS side information, and in certain embodiments, solves minimizing the quantity of the resource provided required for network-assisted information.Embodiment disclosed herein provides the several methods eliminating and/or suppress the quantity of the side information that receiver must send for reducing network-assisted interference.Signaling minimize the optimization be not only possible NA-ICS scheme, and when very limited available signalling bandwidth and can use and need to notify a large amount of interference transmission plans, minimizing of signaling can be regarded as requirement.In simple implementation, the UE needed interference is also available by the full detail be sent out via PDCCH.
According to embodiment, provide the Signalling method for minimizing NA-ICS side information.According to the kind of the Signalling method used, NA-ICS side information signal can be sent to UE by service eNB or each interference eNB.
In the Part I of this joint, outline the possible transmission option in LTE, and explain the reason that signaling consumption should be minimized.Part II discloses several embodiments that can realize significant signaling and reduce.
the possible transmission configuration of each interference signal:
According to the transmission mode of interfered cell and its configuration, effective channel directly can be estimated or must be calculated from the estimation to interference channel (obtaining from cell specific reference symbol) and precoding (must explicitly signal be sent out) from the rectification reference symbol of precoding.Under any circumstance, the modulation symbol collection (that is, QPSK, 16QAM or 64QAM) of single transmission block or the modulation scheme of two transmission blocks are to being sent out by explicitly signal.The quantity of the transmitting antenna port (being applicable to transmission mode 1-6) that intruder uses and cell i d can be obtained by UE or (partly) is sent out with signal statically.
Table (table 1) below provides the general introduction to each transmission mode that interfered cell uses.In last row of table, list the quantity of possible config option.These quantity are mainly intended to illustrate scope instead of the quantity accurately of possible config option, because this depends on further hypothesis for some transmission modes.
Table 1: the general introduction of transmission mode and IC/IS signaling request
SFBC transmits the rollback (fallback) that can be used as in other transmission modes nearly all.Embodiment disclosed herein does not need the rollback/non-rollback operation distinguished in other transmission modes, because SFBC/TM2 can be sent out to indicate rollback operation with signal.
From general introduction above, for LTERel-11 system, needs are distinguished by about 800 different transmission options, are sent to UE for by NA-ICS side information signal.Suitable message is therefore by needs 10 and will be only effective to the transmission from an eNodeB on PRB and TTI.Therefore single eNodeB must provide the signaling information of nearly 100 × 10=10 kilobit, for every 1msTTI in the upper transmission of 100 PRB (20MHz system bandwidth), produce the signaling data speed of 10 MBPSs (10Mbit/s).The UE with NA-ICS function may want to suppress multiple interference eNodeB, thus makes the signaling rate needed by further convergent-divergent.Clearly, high like this signaling rate by be forbid or at least seriously limit possible performance gain.
for minimizing the method for the signaling information of needs:
The basis of method be below exist primary key this, primary key originally comprise as above table in illustrational all possible interference transmission configuration (and may comprise more).
method A: the quantity originally reducing transmission option by introducing less signaling code:
Although there is transmission possibilities different in a large number in LTE, will only use their subset in systems in practice.This impels the restricted number by the exchanged information of TTI is the subset of the maximally related possibility of long period section (such as, several seconds (thousands of TTI) or even longer).Can provide primary key originally, all transmission options in more than 800 transmission options above primary key originally such as comprises shown in table.Entry in such code book can with 10 or even more multidigit encoded.Can provide less signaling code book, less signaling code book allows available interference the with larger primary key to transmit maximally related interference that option distinguishes mutually and transmit option.Such code book can have small size as 8 entries (3) or 16 entries (4), and therefore will limit the amount of information that must be sent out by TTI signal significantly.Signaling code book semi-statically can be established based on the higher level signaling between eNodeB and UE, such as, when it is registered in systems in which or initiate high data rate transfer (NA-ICS supports to be of value to high data rate transfer).Higher level signaling will require that eNodeB passes on which entry in less signaling code book to be filled being used for which entry of autonomous code book (namely with from this which entry of primary key being associated).Such as, when 16 entry signaling code books, 160 (16*10=160) position sends complete code book by being required with signal or 14 (4+10=14) position will enough be used for the single entry upgraded in signaling code book.
Because the entry upgrading signaling code book only needs a few position, the signaling code that eNB can also be suitable in shorter time frame (such as, the order of magnitude of 50 to 1000TTI) reflected current scheduling situation originally.Such as, based on downlink traffic situation, the eNB of user in service interfered cell can predict this user will be scheduled in the immediate future and probably only single or at least only very the transmission configuration of limited quantity will be used layer, the identical modulation scheme etc. of single transmission mode, equal number (such as, only).In this case, this transmission configuration can dynamically be added to signaling code book.
Signaling code book can also comprise default entry (such as, 0), and the option exchanged before default entry only indicates is all inapplicable, thus UE must be operated when supporting without NA-ICS.
As mentioned above, embodiment disclosed herein is for minimizing NA-ICS signaling message.The signaling code book of expection can use (higher level) RRC signaling between UE and its service eNB to set up.Use each TTI signaling of the short-term of this simplification code book then can realize with from service eNB to the DCI of the UE be disturbed instruction.But especially for short-term signaling, it is feasible for not relying on the different signaling mechanism extending DCI signaling.Such as, short-term signaling can use non-DCI message to provide by service eNB, or it directly can carry out self-interference eNB.
For why less signaling code book enough for catching most important transmission option from a lot of transmission options shown in table, can exist a lot of reasons:
-interference eNodeB may have the hardware constraints (such as, only 2 Tx antennas) for good and all getting rid of a large amount of option.Such as, it will be impossible for having the total Options that order is greater than 2.
-interference eNodeB is configured to only to be undertaken operating by particular transmission scheme or does not even support these particular transmission scheme based on their hardware or firmware implementation.
-when a high proportion of line-of-sight transmission, the typical propagation conditions in interfered cell such as very rarely can utilize such as more than 2 transport layers.
-some interference transmission options may be the unsuitable candidates of NA-ICS operation, such as (suppose), UE possibly cannot have to utilize 4 of 64QAM layers of knowledge transmitted from intruder and benefits, because such transmission has been very similar to AWGN (AWGN is corresponding with the layer of unlimited amount or the transmission of other kinds, and higher-order modulation is also close to AWGN).
-utilize precoding (in TM4) based on code book, eNodeB can apply codebook subset restriction, thus make some PMI to be used in community never.
The transmission option of some possible in theory in-LTE may be very rare, such as, has the operation of CDD open loop MIMO in TM3, and the modulation wherein on two transmission blocks is that (very) is different.
In fact-some LTE transmission patterns may be used never, because they are optional (such as, TM5) or only will be used to (such as, to have the TM1 of the eNB being equipped with two antennas) in failure system.
method B: the higher level set up from UE to eNodeB is fed back to notify specific NA-ICS energy power
The signaling code this method mentioned in method A can by comprise from UE feedback (namely, shake hands (handshake) by introducing, wherein UE indicates NA-ICS will be very favorable or complete disadvantageous use-case based on the NA-ICS receiver implemented in UE) be expanded.Like this, signaling can be only limited to those use-cases being hopeful most to help UE receiver by eNodeB.Such as (suppose), particular UE receiver implementation may not from modulated about interference 64QAM or it using cannot to cancel the knowledge of the layer exceeding maximum quantity based on the transmission of DM-RS or it and benefiting.
method C: by the quantity only providing specific prior information to reduce signaling option
UE receiver may can blind Detecting certain interference transmission existence and structure.Such as, for the interference based in community or minizone DM-RS, UE independently may can detect the existence of interfere with layer, and therefore may information only to relevant with modulation scheme interested.Or as another example, UE receiver can be very powerful and independently can detect the major part in the structure of interference transmission, but will need to forbid that time of quantity or computational resource and power have come.In order to adapt to such situation, some embodiments can increase the primary key of all possible transmission option originally to comprise the classification (by sending the classification of these transmission options via signaling code book signal) of transmission option in addition, provide the most helpful priori side information to UE.Exemplarily, then primary key originally will comprise the entry of transmission plan, such as:
οSFBC
ο is based on the precoding of code book
ο CDD open-loop precoding
ο is based on the transmission of DM-RS
ο is based on the multi-user of DM-RS
ο is based on the CoMP of DM-RS
The modulation of a ο only transmission block
The combinations of modulation of ο two transmission blocks
In addition or individually, providing of side information can also by providing transmission statistic to UE.Such as, if the histogram of the eNodeB frequency that semi-statically provides different transmission modes to use in the cell, UE can by test transmission hypothesis by its blind decoding strategy of possibility alignment sent.Histogram information can be provided with more or less quantification details (such as, being low to moderate units percentage or coarse binary system, such as " front 5% ", " front 10% ", " front 35% ", " remaining ").If specific transmission option is not comprised in current signaling code book, such statistics side information can replace short-term signaling to be provided (therefore saving short-term signaling completely) or be provided as backup information for helping UE blind decoding.
method D: utilize the correlation in time domain and frequency domain to reduce signaling message:
The distribution of interference transmission can often change on PRB and every TTI ground, because the scheduler in interfered cell freely dispatches their user by the mode that they are wished.But frequent Existence dependency in time domain and frequency domain, such as, because interference user is assigned with more than 1 PRB usually, because according to the resource allocation type used, PRB must be assigned with by Resource Block group.LTE standard requires all PRB belonging to a user in the TTI considered to show the layer of equal number and the identical modulation scheme of every layer of display.In addition, precoding may be different between different PRB, but specifically and be therefore identical to the PRB of multiple vicinity because CSI (PMI) feedback (eNodeB selects downlink precoding device (in FDD system) according to this CSI feedback) is only sub-band, in addition the precoder of contiguous PRB usually by be identical (in fact, for TM9 and TM10 relying on frequency domain PMI/RI report, the precoding of contiguous PRB group must be identical, the 7.1.6.5 " PRB binding " see in 36.213).In addition, the PRB for the transmission to a user can not press any-mode distribution over a frequency range.On the one hand, down link control information only permission signal transmission specifically distributes type (such as, Resource Block group), and on the other hand, CQI feedback also can be only that sub-band is specific, thus makes scheduler usually by contiguous for distribution PRB (contiguous PRB group).
Therefore, NA-ICS feedback message can be designed as the state of the contiguous PRB that encodes with only distinguishing.An example implementation of this signaling will send an entry of signaling code book (such as, 4) with signal for one group of 4 PRB and provide this message which in 4 PRB (4) to be effective bitmap to.Substitute 4, it may be enough for only sending 3 with signal, because there is less motivation to indicate not relevant to any PRB configuration (a kind of situation) or only relevant with single PRB configuration (4 kinds of situations), and it can not be applicable to two non-adjacent PRB (3 kinds of situations: XooX, XoXo, oXoX), make residue 8 (16-1-4-3=8) plant situation 3 transmissions.Like that, 7 (or 8) instead of 16 can be provided with for nearly 4 PRB, the NA-ICS side information in this example.In order to enable larger PRB group (wherein, a NA-ICS signaling information is effective to PRB as much as possible), eNodeB scheduler can be prompted to correspondingly dispatch compatible PRB group.But such scheduling restriction may cause systematic function to detract.
The another way reducing signaling utilizes the correlation in the time domain between TTI by being.This can be done by with mode similar before, and such as can consider that semi-persistent scheduling (SPS) configures in addition.Finally, the scheduling in adjacent cell can be prompted to be easier to be predicted by the UE be disturbed, thus makes it will know NA-ICS information in advance.In addition, but, large hydraulic performance decline is probably caused to such restriction of the scheduling in system.
method E: reduce signaling message with the different information that signal sends in time domain and/or frequency domain:
Method before the method is similar to, but the identical configuration of the method not in dependent on neighboring PRB, but send difference with signal.The method is favourable in following situation: the configuration for two UE is similar, be likely this situation, because UE is arranged in identical community and therefore may experience similar channel (at least when being arranged in the similar region of community), such as, experiences the similar order of channel thus experience the layer of similar quantity.The configuration of the one UE will be sent out with signal as a rule, but for the 2nd UE, only difference signal is sent out.In the simplest situation (and the most general situation), two configuration signals of two UE are sent out, and divide which PRB be used to one configuration and which PRB be used to another configuration.The information of the latter can use bitmap types signaling signal as mentioned above to be sent out, but it is just enough probably to provide the scope (or a pair scope) that each UE is scheduled.
Fig. 3 shows the structure of the down-chain resource grid of the downlink transmission from eNB to UE according to some embodiments.The grid described shows T/F grid (being called as resource grid), and it is the physical resource in the down link in each time slot.Such T/F plane represents it is the conventional practice for ofdm system, and this makes it be intuitively for radio resources allocation.The often row of resource grid are with often row is corresponding with an OFDM symbol and an OFDM subcarrier respectively.In time domain, the duration of resource grid is corresponding with the time slot of in radio frame.Minimum T/F unit in resource grid is represented as element of resource.Each resource grid comprises some Resource Block, and Resource Block describes the mapping of particular physical channel to element of resource.Each Resource Block comprises a lot of element of resource, and this represents the minimum of the current resource that can be assigned with in a frequency domain.There is some different physical down link channels, these physical down link channels use such Resource Block transmission.Especially relevant to the disclosure, two in these physical down link channels is physical down link sharing channel and physical downlink control channel.
User data and higher level signaling are sent to UE110 (Fig. 1) by physical down link sharing channel (PDSCH).Physical downlink control channel (PDCCH) transmits the transformat relevant with the same PDSCH channel information etc. relevant with Resourse Distribute.PDCCH also notifies that UE is about the transformat relevant with uplink shared channel, Resourse Distribute and H-RAQ information.Usually, downlink scheduling (distribute to the UE in community and control and shared channel resources block) is performed based on the channel quality information fed back from UE to eNB at eNB place, and then downlink resource allocations information is for the control channel (PDCCH) of (being assigned to) UE is sent to UE.
PDCCH uses CCE (control channel element) to carry out communicating control information.Before being mapped to element of resource, first PDCCH complex-valued symbol is organized into tetrad (quadruplets), and then tetrad uses sub-block interleaver to be arranged for rate-matched.To use in these control channel elements (CCE) one or more is sent out for each PDCCH, wherein nine of each CCE and four physical resource key elements gather (being called as element of resource group (REG)) corresponding.Four QPSK symbols are mapped to each REG.PDCCH can use one or more CCE (depending on size and the channel condition of DCI) to be sent out.The four or more different PDCCH form that the CCE (such as, polymerization grade, L=1,2,4 or 8) that utilizes varying number defines in LTE can be there is.
Fig. 4 shows the functional block diagram of the UE according to some embodiments.UE400 goes for being used as UE110 (Fig. 1).UE400 can comprise physical layer circuit 402, sends signal to eNB104 (Fig. 1) and from eNB104 Received signal strength for using one or more antenna 401.UE400 can also comprise media access control layer (MAC) circuit 404, for controlling the access to wireless medium.UE400 can also comprise the treatment circuit 406 and memory 408 that are arranged to and perform operation described herein.According to embodiment, UE400 can be arranged to and receive network-assisted (NA) interference elimination signaling (ICS) (NA-ICS) side information for performing interference mitigation discussed above from eNB.
In certain embodiments, UE400 can be a part for following portable radio communication device: such as, personal digital assistant (PDA), the laptop computer with wireless communication ability or portable computer, web-tablet, radio telephone, smart mobile phone, wireless headset, beep-pager, instant messaging equipment, digital camera, access point, TV, Medical Devices (such as, heart rate monitor, blood pressure monitor etc.) or can wireless receiving and/or send the miscellaneous equipment of information.In certain embodiments, what UE400 can comprise in the following is one or more: keyboard, display, nonvolatile memory port, multiple antenna, graphic process unit, application processor, loud speaker and other mobile device element.Display can be the lcd screen comprising touch-screen.
The one or more antennas 401 utilized by UE400 can comprise one or more directional antenna or omnidirectional antenna, such as, comprise dipole antenna, unipole antenna, paster antenna (patchantennas), loop aerial (loopantennas), microstrip antenna or be applicable to the antenna of the other types transmitting RF signal.In certain embodiments, substitute two or more antenna, the individual antenna with multiple aperture can be used.In these embodiments, each aperture can be regarded as independently antenna.In some multiple-input and multiple-outputs (MIMO) embodiment, antenna can be effectively separated, to utilize the space diversity and different channel characteristics that can produce between each antenna and the antenna of dispatching station.In some MIMO embodiments, these antenna can by the wavelength or farther separately up to 1/10.
Although UE400 is shown as have several independently function element, but one or more in these function element can be combined and can be realized by the combination of the element of software merit rating (such as, comprising the treatment element of digital signal processor (DSP)) and/or other hardware element.Such as, some elements can comprise one or more microprocessor, DSP, application-specific integrated circuit (ASIC) (ASIC), radio frequency integrated circuit (RFIC) and the combination for the various hardware and logical circuit that perform function at least described herein.In certain embodiments, function element can refer to one or more treatment elements of operating on one or more treatment element.
Embodiment can be implemented in hardware, firmware and software one or its combination.Embodiment can also be implemented as the instruction be stored on computer-readable recording medium, and instruction can be read by least one processor and perform thus perform operation described herein.Computer-readable recording medium can comprise any non-transient state mechanism for information being stored as the readable form of machine (such as, computer).Such as, computer-readable recording medium can comprise read-only memory (ROM), random access memory (RAM), magnetic disk storage medium, optical storage media, flash memory device and other memory device and medium.In these embodiments, one or more processors of UE400 can be configured with the instruction for performing operation described herein.
In certain embodiments, UE400 can be configured to receive ofdm communication signal over a multicarrier communication channel according to ofdma communication technology.Ofdm signal can comprise multiple orthogonal sub-carriers.In some broad band multicarrier embodiments, eNB can be a part for following broadband wireless access (BWA) network communication network: such as, World Interoperability for Microwave Access, WiMax (WiMAX) communication network or third generation partner program (3GPP) universal terrestrial radio access network (UTRAN) Long Term Evolution (LTE) or Long Term Evolution (LTE) communication network, but scope of the present invention is not limited thereto.In these broad band multicarrier embodiments, UE400 with eNB can be configured to communicate according to OFDM (OFDMA) technology.
In some LTE embodiments, the elementary cell of Radio Resource is Physical Resource Block (PRB).PRB can comprise the 0.5ms in 12 subcarrier × time domains in frequency domain.PRB can distribute (in the time domain) in pairs.In these embodiments, PRB can comprise multiple element of resource (RE).RE can comprise subcarrier × mono-symbol.
ENB can send the reference signal of two types, comprises rectification reference signal (DM-RS), channel state information reference signals (CIS-RS) and/or public reference signal (CRS).DM-RS can be used for data demodulation by UE.Reference signal can be sent out in predetermined PRB.
In certain embodiments, OFDMA technology can be the one in frequency domain duplex (FDD) technology or time domain duplex (TDD) technology, wherein FDD technology uses different up links and downlink spectrum, and TDD technology uses identical frequency spectrum for up link and down link.
In some other embodiments, UE400 and eNB can be configured to transmit and use other modulation techniques one or more (such as, band spectrum modulation (such as, direct sequence CDMA (DS-CDMA) and/or frequency hopping code division multiple (FH-CDMA)), time division multiplexing (TDM) modulation and/or frequency division multiplex (FDM) modulation) signal that is sent out, but the scope of embodiment is not limited thereto.
In some LTE embodiments, UE400 can calculate several different value of feedback, and these different values of feedback can be used to perform the channel adaptation for closed loop spatial multiplexing transmission pattern.These values of feedback can comprise CQI (CQI), order designator (RI) and precoding matrix indicators (PMI).By CQI, transmitter selects one in several modulation symbol collection and code rate combination.RI notice transmitter is about the quantity of the useful transport layer of current mimo channel, and PMI instruction is used in the code book index (depending on the quantity of transmitting antenna) of the pre-coding matrix at transmitter place.The code rate that eNB uses can based on CQI.PMI can be calculated by UE and be reported to the vector of eNB.In certain embodiments, UE can send comprise CQI/PMI or RI form 2,2a or 2b physical uplink control channel (PUCCH).
In these embodiments, CQI can be the instruction of the down link mobile radio channel quality experienced about UE400.CQI allows UE400 to propose the optimum modulation scheme that uses for given radio link quality and code rate to eNB, thus makes the transmission block error rate produced will be no more than particular value (such as, 10%).In certain embodiments, UE can report broadband CQI value, and this value refers to the channel quality of system bandwidth.UE can also report can by the sub-band CQI value of each sub-band of the specific quantity Resource Block of more high-rise configuration.The complete set of sub-band can covering system bandwidth.When spatial multiplexing, the CQI of each code word can be reported.
In certain embodiments, PMI can pointer to given radio condition, the best pre-coding matrix that eNB will use.PMI value quotes code book table.The quantity of the Resource Block that network configuration is represented by PMI report.In certain embodiments, in order to covering system bandwidth, multiple PMI report can be provided.PMI report can also be provided for closed loop spatial multiplexing, multiuser MIMO and closed loop order 1 precoding MIMO pattern.
In some coordinate multipoint (CoMP) embodiment, network can be arranged to and carry out joint transmission to UE, and wherein two or more cooperation/collaborative point (such as, remote radio heads (RRH)) combines transmission.In these embodiments, joint transmission can be MIMO transmission and cooperation point be configured to perform united beam form-endowing.
Summary is provided as meeting 37C.F.R1.72 (b) joint, and this joint requires that summary allows reader to determine character disclosed in this technology and purport.Summary is according to not being used to restriction or explaining that the scope of claim or the understanding of meaning are submitted to.Therefore claim is below integrated in detailed description, and wherein each claim oneself is as independent embodiment.

Claims (17)

1. the method performed by the enhancement mode Node B (eNB) in LTE network, described method is used for providing network-assisted to subscriber equipment (UE) and alleviates for coordinates interference, and described method comprises:
Utilize the transmission option that less signaling code book indicated number amount reduces, described less signaling code book has entry, and the entry of described less signaling code book is the subset of larger primary key entry originally; And
There is provided network-assisted (NA) to disturb to described UE and eliminate signaling (ICS) (NA-ICS) side information, as a part for NA-ICS feedback message, the designator of signaling code book less described in described side information comprises,
Wherein, described UE is arranged to and originally performed interference cancellation techniques based on described less signaling code.
2. the quantity the method for claim 1, wherein reducing transmission option comprises the entry of signaling code book less described in transmission, and the entry of described less signaling code book is transmitted with the position that the position needed for the entry than primary key basis larger described in transmission is less,
Wherein, described less signaling code book is arranged to the predetermined subset catching transmission option.
3. method as claimed in claim 2, also comprises:
Receive the higher level feedback of the NA-ICS ability of the described UE of instruction; And
Described NA-ICS ability based on described UE is restricted to the transmission option of described UE.
4. method as claimed in claim 2, also comprises:
In primary key basis larger described in the entry being used for predetermined interference transmission is included in; And
In signaling code book less described in the subset of the described entry being used for described predetermined interference transmission being included in, the subset of described entry is selected based on the possibility of described UE experience interference transmission.
5. method as claimed in claim 2, also comprises:
Each entry in signaling code book less described in being encoded to distinctively by the designator being close to Physical Resource Block (PRB) group, these contiguous PRB groups are identified as interference.
6. method as claimed in claim 5, also comprises: in described NA-ICS feedback message, send the different information for the designator of described contiguous PRB group with signal.
7. method as claimed in claim 2, also comprises:
By disturb the designator of Transmission Time Interval (TTI) be encoded to distinctively described in each entry in less signaling code book.
8. as the method that claim 7 is stated, also comprise: the different information sending the designator for described interference TTI in described NA-ICS feedback message with signal.
9. an enhancement mode Node B (eNB), described eNB is arranged to provides network-assisted for coordinates interference alleviation to subscriber equipment (UE), and described eNB comprises the treatment circuit being arranged to and performing the following operation:
Utilize the transmission option that less signaling code book indicated number amount reduces, described less signaling code book has entry, and the entry of described less signaling code book is the subset of larger primary key entry originally; And
There is provided network-assisted (NA) to disturb to described UE and eliminate signaling (ICS) (NA-ICS) side information, as a part for NA-ICS feedback message, the designator of signaling code book less described in described side information comprises,
Wherein, described UE is arranged to and originally performed interference cancellation techniques based on described less signaling code.
10. eNB as claimed in claim 9, wherein, the transmission option reduced to indicate quantity, described eNB is arranged to: the entry of signaling code book less described in transmission, the entry of described less signaling code book is transmitted with the position that the position needed for the entry than primary key basis larger described in transmission is less
Wherein, described less signaling code book is arranged to the predetermined subset catching transmission option.
11. eNB as claimed in claim 10, are also configured to:
Receive the higher level feedback of the NA-ICS ability of the described UE of instruction; And
Described NA-ICS ability based on described UE is restricted to the transmission option of described UE.
12. eNB as claimed in claim 10, are also configured to:
In primary key basis larger described in the entry being used for predetermined interference transmission is included in; And
In signaling code book less described in the subset of the described entry being used for described predetermined interference transmission being included in, the subset of described entry is selected based on the possibility of described UE experience interference transmission.
13. eNB as claimed in claim 10, are also configured to:
Each entry in signaling code book less described in being encoded to distinctively by the designator being close to Physical Resource Block (PRB) group, these contiguous PRB groups are identified as interference.
14. eNB as claimed in claim 13, are also configured to: in described NA-ICS feedback message, send the different information for the designator of described contiguous PRB group with signal.
15. eNB as claimed in claim 10, are also configured to: each entry in signaling code book less described in being encoded to distinctively by the designator for interference Transmission Time Interval (TTI).
16. eNB stated as claim 15, are also configured to: the different information sending the designator for described interference TTI in described NA-ICS feedback message with signal.
17. 1 kinds of non-transitory computer readable storage medium storing instruction, described instruction is used for being run to perform by one or more processor providing network-assisted operation to alleviate for coordinates interference to subscriber equipment (UE), and described operation comprises:
Utilize the transmission option that less signaling code book indicated number amount reduces, described less signaling code book has entry, and the entry of described less signaling code book is the subset of larger primary key entry originally; And
There is provided network-assisted (NA) to disturb to described UE and eliminate signaling (ICS) (NA-ICS) side information, as a part for NA-ICS feedback message, the designator of signaling code book less described in described side information comprises,
Wherein, described UE is arranged to and originally performed interference cancellation techniques based on described less signaling code.
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